| MODEL | DUCATI 125 GRAN SPORT "MARIANNA" 1955 |
| Year | 1955 |
| Engine Type | Four stroke, single cylinder, OHC, cylinder inclined 10 degrees |
| Displacement / Capacity | 122 cc / 7.4 cu in |
| Bore X Stroke | 55.5 x 52 mm |
| Compression Ratio | — |
| Cooling System | — |
| Max Power | 8.8 kW / 12 hp @ 9800 rpm |
| Max Torque | — |
| Ignition | — |
| Induction | — |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | — |
| Clutch | — |
| Final Drive | — |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | — |
| Rear Suspension | — |
| Front Brakes | — |
| Rear Brakes | — |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | — |
| Rear Tyre | — |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | — |
The Gran Sport, nicknamed Marianna, was Fabio Taglioni's first overhead-cam Ducati single and was built as a lightweight racer. It appeared in 100 cc form and was bored out to 122 cc for 1955. Marianna machines swept the 100 cc class of the 3,400 km Giro d'Italia that May and also outran 125s. It became the template for Ducati's later road and race singles.
